title: Communication: CO oxidation by silver and gold cluster cations: identification of different active oxygen species.
abstract: The oxidation of carbon monoxide with nitrous oxide on mass-selected Au(3)(+) and Ag(3)(+) clusters has been investigated under multicollision conditions in an octopole ion trap experiment. The comparative study reveals that for both gold and silver cations carbon dioxide is formed on the clusters. However, whereas in the case of Au(3)(+) the cluster itself acts as reactive species that facilitates the formation of CO(2) from N(2)O and CO, for silver the oxidized clusters Ag(3)O(x)(+) (n=1-3) are identified as active in the CO oxidation reaction. Thus, in the case of the silver cluster cations N(2)O is dissociated and one oxygen atom is suggested to directly react with CO, whereas a second kind of oxygen strongly bound to silver is acting as a substrate for the reaction.
authors.affiliation: Institute of Surface Chemistry and Catalysis, University of Ulm, Albert-Einstein-Allee 47, 89069 Ulm, Germany.
authors.forename: Denisia M
authors.initials: DM
authors.lastname: Popolan
authors.forename: Thorsten M
authors.initials: TM
authors.lastname: Bernhardt
mesh_terms: D002245:Carbon Dioxide / Q000138:chemical synthesis / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D009609:Nitrous Oxide / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D002412:Cations; D002245:Carbon Dioxide; D012834:Silver; D006046:Gold; D002248:Carbon Monoxide; D009609:Nitrous Oxide; D010100:Oxygen